Managing your mortgage

What to do at every rollover, and what refixing, refinancing or paying extra is actually worth.

Ends with: A rollover you decide rather than drift through, and a repayment plan with a number attached.

12 steps
11 calculators
1.7 hours of reading
Not started

Almost everything written about mortgages in New Zealand is about getting one. The twenty-five years afterwards get far less attention, and that is where the money is: the difference between a mortgage handled well and one left alone runs to tens of thousands of dollars over a term, and almost all of it is decided at a handful of moments. A fixed term ending is the main one, and it arrives every one to five years with a letter that most people either ignore or accept. This pathway works through what to do at each of those moments. It covers refixing and how it differs from refinancing, what a break fee is and when it is nil, whether an offset or revolving credit account is worth the higher rate, what an extra payment actually saves, and what interest-only really costs. It ends with the two things people ask least and need most: how much you could borrow if you moved, and what the Reserve Bank changing the OCR does to the rate you pay.

Calculate.co.nz is proud to be partnered with Premium Homes, a recognised leader in eco-friendly, sustainable, and energy-efficient homebuilding. With a dedicated team and award-winning experience, they create homes that prioritise health, comfort, and long-term performance. Their founders, Andrew and Kelly, set out to raise the standard of residential construction in New Zealand by combining practical building expertise with a clear commitment to doing things better for homeowners.
Premium Homes: warmer, drier, healthier. No condensation, ever.
Advertise on this page

  1. What you actually signed

    Term, rate, structure and repayment type are four separate decisions and most people made all four in an afternoon. Worth understanding before the first rollover rather than during it.

    Work out your own: Advanced Mortgage Calculator 10 min read

  2. What the repayment is made of

    Early payments are almost entirely interest because the balance is large. Seeing the split is what makes every other decision in this pathway make sense.

    Work out your own: Home Loan Repayment Calculator 8 min read

  3. The rollover decision

    A fixed term ending is the one moment you have leverage. Doing nothing puts you on the floating rate, which is almost always the most expensive option available to you that day.

    Work out your own: Fixed Rate Rollover Calculator 9 min read

  4. Refix or refinance

    Refixing is a new rate with the same bank. Refinancing is a new bank. One is a phone call, the other is legal fees, a valuation and a cash contribution, and the better answer depends on the gap between the rates.

    Work out your own: Refinance Calculator 9 min read

  5. What breaking early costs

    A break fee compensates the lender for the rate difference over the remaining term. It is large when wholesale rates have fallen since you fixed and usually nil when they have risen, which is the opposite of what most people assume.

    Work out your own: Break Fee Calculator 10 min read

  6. Paying it off faster

    Rounding a payment up, paying fortnightly instead of monthly, or keeping the payment level when rates fall are the three that need no extra money and shorten a term by years.

    Work out your own: Extra Repayment Calculator 10 min read

  7. Offset and revolving credit

    Both let your savings reduce the balance interest is charged on, at a higher headline rate. Whether that trade pays depends on how much cash you keep and how disciplined you are, and the arithmetic is not close either way.

    Work out your own: Revolving Credit Calculator 9 min read

  8. Interest-only, and what it defers

    Payments drop because nothing is being repaid. The balance is unchanged when the period ends and the full amount is still owed, so it buys time rather than money.

    Work out your own: Interest-Only Calculator 8 min read

  9. When breaking is worth it anyway

    Sometimes the saving beats the fee, usually when rates have moved a long way or you are selling. The only way to know is to put both numbers side by side.

    Work out your own: Break Fee Calculator 8 min read

  10. What you could borrow now

    Useful before you move, and useful as a reality check on where you are. Servicing tests use a rate well above the one you would actually pay.

    Work out your own: Borrowing Capacity Calculator 8 min read

  11. Debt to income, and why it bites differently

    A DTI limit does not improve when house prices rise, which is exactly why the Reserve Bank uses it alongside LVR. It constrains borrowers that an equity test would let through.

    Work out your own: DTI Calculator 7 min read

  12. What the OCR actually changes

    Floating rates follow the OCR closely and quickly. Fixed rates follow longer wholesale rates and often move before the announcement rather than after it, which is why the news and your rate rarely agree.

    8 min read

When to stop and get someone else

A mortgage adviser is usually free to you, paid by the lender, which is worth knowing in both directions: the advice is genuinely useful and the incentive is to place the loan. For a break fee, ask your bank for the figure in writing before you commit to anything, because it is calculated on the day and quotes go stale. If you are in difficulty, contact the bank before you miss a payment rather than after: hardship provisions exist and they are considerably easier to access early.

This pathway is information, not financial advice. Rates, thresholds and rules change; every guide carries the date it was last reviewed.

Ticking a step keeps your place in this browser only. There is no account and nothing is sent anywhere, so clearing your browsing data will clear it too.

Back to all pathways · Browse the full guide library · All mortgage calculators

Frequently asked questions

Is it better to refix or refinance my mortgage?

Refixing is a new rate with your existing bank and usually takes a phone call. Refinancing moves the loan to a different bank and brings legal fees, often a valuation, and possibly a break fee, offset by any cash contribution the new bank pays. Refinancing wins when the rate gap is wide enough to cover those costs over the remaining term, so the answer depends on the numbers rather than on a rule.

What happens if I do nothing when my fixed rate ends?

The loan rolls onto the bank standard floating rate, which is almost always higher than any fixed rate on offer that day. Banks write to you before the rollover date precisely because doing nothing is expensive, and the letter is easy to miss. Setting a reminder a month before the expiry date is the single highest-value habit in this pathway.

Does paying fortnightly instead of monthly really save money?

Yes, if the fortnightly payment is half the monthly one. There are 26 fortnights in a year and only 24 half-months, so you make the equivalent of one extra monthly payment a year without noticing. On a typical New Zealand mortgage that shortens the term by several years and saves a substantial amount of interest.

When is a mortgage break fee nil?

Usually when wholesale interest rates have risen since you fixed. The fee compensates the lender for lending your money out again at a lower rate than you agreed to pay, so if rates have gone up the lender is not worse off and there is often nothing to charge beyond an administration fee. Ask for the figure in writing, because it is calculated on the day.